today, former president bill clinton attended a memorial service at a grave in which thousands were laid to rest. while some progress has been made, the suffering continues there on a vast scale. nbc's mark potter is there. >> reporter: three years after the earthquake, the haitian capital is bustling. the downtown rubble is cleaned up. buildings are under repair. the damaged presidential palace has been knocked down, and the famed iron market is again selling goods. still, with 70% unemployment, there are massive problems, and concerns that the promise haiti would be rebuilt better than ever is unfulfilled. jonathan katz writes about haiti's reconstruction. >> there has not been a concerted effort to help build a strong, independent, competent haitian government and civil society that is able to handle its own problems. >> reporter: while more than a million people have moved out of evacuation camps, nearly 300,000 remain. amnesty international calls the housing shortage catastrophic. another continuing crisis is health care. >> cholera has been disastrous. over 6% of the population has